<template>
    <div>
        <!-- 面包屑导航区 -->
        <el-breadcrumb separator-class="el-icon-arrow-right">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>添加商品</el-breadcrumb-item>
        </el-breadcrumb>
        <!-- 卡片视图区 -->
        <el-card>
            <!-- 提示区域 -->
            <el-alert title="添加商品信息" type="info" center show-icon :closable="false">
            </el-alert>
            <!-- 步骤条 -->
            <el-steps :space="200" :active="activeIndex - 0" finish-status="success" align-center>
                <el-step title="基本信息"></el-step>
                <el-step title="商品参数"></el-step>
                <el-step title="商品属性"></el-step>
                <el-step title="商品图片"></el-step>
                <el-step title="商品内容"></el-step>
                <el-step title="完成"></el-step>
            </el-steps>
            <!-- tab栏区域 -->
            <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="100px" label-position="top">
                <el-tabs v-model="activeIndex" :tab-position="'left'" :before-leave="beforeTabLeave" @tab-click="tabClicked">
                    <el-tab-pane label="基本信息" name="0">
                        <el-form-item label="商品名称" prop="goods_name">
                            <el-input v-model="addForm.goods_name"></el-input>
                        </el-form-item>
                        <el-form-item label="商品价格" prop="goods_price">
                            <el-input v-model="addForm.goods_price" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品重量" prop="goods_weight">
                            <el-input v-model="addForm.goods_weight" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品数量" prop="goods_number">
                            <el-input v-model="addForm.goods_number" type="number"></el-input>
                        </el-form-item>
                        <el-form-item label="商品分类" prop="goods_cat">
                            <el-cascader
                                v-model="addForm.goods_cat"
                                :options="catelist"
                                :props="{ expandTrigger: 'hover', ...cateProps }"
                                @change="handleChange">
                            </el-cascader>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品参数" name="1">
                        <!-- 渲染表单的item项 -->
                        <el-form-item :label="item.attr_name" v-for="item in manyTableData" :key="item.attr_id">
                            <!-- 复选框组 -->
                            <el-checkbox-group v-model="item.attr_vals">
                                <el-checkbox border :label="cb" v-for="(cb, i) in item.attr_vals" :key="i"></el-checkbox>
                            </el-checkbox-group>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品属性" name="2">
                        <el-form-item :label="item.attr_name" v-for="item in onlyTableDate" :key="item.attr_id">
                            <el-input v-model="item.attr_vals"></el-input>
                        </el-form-item>
                    </el-tab-pane>
                    <el-tab-pane label="商品图片" name="3">
                        <!-- action 表示图片要上传到的后台API地址 -->
                        <el-upload
                            :action="uploadURL"
                            :on-preview="handlePreview"
                            :on-remove="handleRemove"
                            list-type="picture" :headers="headerObj" :on-success="handleSuccess">
                            <el-button size="small" type="primary">点击上传</el-button>
                        </el-upload>
                    </el-tab-pane>
                    <el-tab-pane label="商品内容" name="4">
                        <!-- 富文本编辑器组件 -->
                        <quill-editor v-model="addForm.goods_introduce"></quill-editor>
                        <!-- 添加商品的按钮 -->
                        <el-button type="primary" class="btnAdd" @click="add">添加商品</el-button>
                    </el-tab-pane>
                </el-tabs>
            </el-form>
        </el-card>
        <!-- 图片预览 -->
        <el-dialog
            title="图片预览"
            :visible.sync="previewVisible"
            width="50%">
            <img :src="previewPath" alt="" class="previewimg">
        </el-dialog>
    </div>
</template>
<script>
import _ from 'lodash'
export default{
    data(){
        return{
            activeIndex:'0',
            // 添加商品的表单数据对象
            addForm:{
                goods_name:'',
                goods_price:0,
                goods_weight:0,
                goods_number:0,
                // 商品所属的分类数组
                goods_cat:[],
                // 图片的数组
                pics:[],
                // 商品的详情描述
                goods_introduce:'',
                attrs:[]
            },
            addFormRules:{
                goods_name:[
                    {required:true, message:'请输入商品名称',trigger:'blur'}
                ],
                goods_price:[
                    {required:true, message:'请输入商品价格',trigger:'blur'}
                ],
                goods_weight:[
                     {required:true, message:'请输入商品重量',trigger:'blur'}
                ],
                goods_number:[
                     {required:true, message:'请输入商品数量',trigger:'blur'}
                ],
                goods_cat:[
                    {required:true, message:'请选择商品分类',trigger:'blur'}
                ]
            },
            // 商品分类列表
            catelist:[],
            cateProps:{
                label:'cat_name',
                value:'cat_id',
                children:'children'
            },
            // 动态参数列表数据
            manyTableData:[],
            // 静态参数列表数据
            onlyTableDate:[],
            // 上传图片的URL地址
            uploadURL:'http://127.0.0.1:8888/api/private/v1/upload',
            // 图片上传组件的header请求头对象
            headerObj:{
                // 在main.js 需要重新绑定Authorization,因为上传组件没有调用axios
                Authorization: window.sessionStorage.getItem('token'),
            },
            // 预览事件赋值
            previewPath:'',
            previewVisible:false
        }
    },
    created(){
        this.getCateList()
    },
    methods:{
        // 获取所有商品分类数据
       async getCateList(){
            const{data:res}=await this.$http.get('categories')
            if(res.meta.status !==200){
                return this.$message.error('获取商品分类数据失败！')
            }
            this.catelist=res.data
            console.log(this.catelist)
        },
        // 级联选择器选中项变化，会触发这个函数
        handleChange(){
            console.log(this.addForm.goods_cat)
            if(this.addForm.goods_cat.length!==3){
                this.addForm.goods_cat=[]
            }
        },
        beforeTabLeave(activeName,oldActiveName){
            if(oldActiveName ==='0' && this.addForm.goods_cat.length !==3){
                this.$message.error('请先选择商品分类')
                return false
            }
            // console.log('即将离开的标签页名字是：'+oldActiveName)
            // console.log('即将进入的标签页名字是：'+activeName)
            // return false
        },
        // tab 被选中时触发
        async tabClicked(){
            // console.log(this.activeIndex)
            // 证明访问的是动态参数面板
            if(this.activeIndex==='1'){
                // console.log('动态参数面板')
               const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'many'}})
               if(res.meta.status !==200){
                   return this.$message.error('获取动态参数列表失败！')
               }
               console.log(res.data)
               res.data.forEach(item=>{
                item.attr_vals= item.attr_vals.length === 0 ? [] : item.attr_vals.split(' ')
               })
               this.manyTableData=res.data
            }else if(this.activeIndex === '2'){
                const{data:res} = await this.$http.get(`categories/${this.cateId}/attributes`,{params:{sel:'only'}})
                if(res.meta.status !==200){
                    return this.$message.error('获取静态属性失败！')
                }
                console.log(res.data)
                this.onlyTableDate=res.data
            }
            
        },
        // 处理图片预览效果
        handlePreview(file){
            console.log(file)
            this.previewPath=file.response.data.url
            this.previewVisible = true
        },
        // 处理移除图片的操作
        handleRemove(file){
            console.log(file)
            // 1.获取将要删除的图片的临时路径
            const filePath=file.response.data.tmp_path
            // 2.从pics数组中找到这个图片对应的索引值
           const i= this.addForm.pics.findIndex(x =>x.pic===filePath)
            // 3.调用数组的splice方法，把图片信息对象，从pics数组中移除
            this.addForm.pics.splice(i ,1)
            console.log(this.addForm)
        },
        // 监听图片上传成功的事件
        handleSuccess(response){
            console.log(response)
            // 1、拼接得到一个图片信息对象
            const picInfo={pic :response.data.tmp_path}
            // 2、将图片信息对象，push到pics数组中
            this.addForm.pics.push(picInfo)
            console.log(this.addForm)
        },
        // 添加商品
        add(){
            // console.log(this.addForm)
            this.$refs.addFormRef.validate(async valid=>{
                if(!valid){
                    return this.$message.error('请填写必要的表单项目！')
                }
                // 执行添加的业务逻辑
                // lodash cloneDeep(obj),深拷贝addForm
               const form= _.cloneDeep(this.addForm)
                form.goods_cat = form.goods_cat.join(',')
                // 处理动态参数
                this.manyTableData.forEach(item=>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals.join(' ')}
                    this.addForm.attrs.push(newInfo)
                })
                // 处理静态属性
                this.onlyTableDate.forEach(item =>{
                    const newInfo={attr_id:item.attr_id,attr_value:item.attr_vals}
                    this.addForm.attrs.push(newInfo)
                })
                form.attrs=this.addForm.attrs
                console.log(form)
                // 发起请求添加商品
                // 商品的名称，必须是唯一的
                const{data:res}=await this.$http.post('goods',form)
                if(res.meta.status !==201){
                    this.$message.error('添加商品失败！')
                }
                this.$message.success('添加商品成功！')
                this.$router.push('/goods')
            })
        }
    },
    computed:{
        cateId(){
            if(this.addForm.goods_cat.length===3){
                return this.addForm.goods_cat[2]
            }
            return null
        }
    }
}
</script>
<style lang="less" scoped>
.el-checkbox{margin: 0 10px 0 0 !important}
.previewimg{width: 100%}
.btnAdd{margin-top: 80px}
</style>